Migrate maildir between servers dovecot

[Davide Gmail]

Hi to all, i have two servers with dovecot 2.2.15 one is actualy on 
production (server A) and another that i put on production soon (server B)
My goal is migrate maildir from server A and server B.
How can i achieve that?
I read http://wiki2.dovecot.org/Migration/Dsync but i haven't understand 
well where to put such configuration (in which server).
Thanks in advance for any help.